I don't know...Ideally, if I was the editor I would make sure that half of those 30 pages is filled with brand new info, stuff that the blog hasn't already talked about. It would ensure that many copies are sold on day one. But, I have the gut feeling they'll just reprint the same info available on the blog and maybe add some small new info.
Magazines can be like that sometimes. And before I get the flame treatment again, I'm just saying to not get your hopes up as it could be just a reprint of the information already seen on the blog.